The state of Michigan says it has seen no additional evidence to support a claim that a famous 17th century ship is buried in northern Lake Michigan.

Divers at the site in October found nothing besides a timber protruding from the lake bottom, a piece of wood that was photographed in 2003 or 2004, Assistant Attorney General Louis Reinwasser said.

The disclosure was made in documents filed this week in federal court in Grand Rapids.

A group called Great Lakes Exploration discovered the timber in 2001 and believes it may be the wreck of the Griffin, a vessel built by French explorer La Salle. It sank in 1679.